Determined never to forget but perhaps ready to move on, the nation gently handed Sept. 11 over to history Sunday and etched its memory on a new generation. A stark memorial took its place where twin towers once stood, and the names of the lost resounded from children too young to remember terror from a decade ago. In New York, Washington and Pennsylvania, across the United States and the world, people carried out rituals now as familiar as they are heartbreaking: American flags unfurled at the new World Trade Center tower and the Eiffel Tower, and tears shed at the base of the Pentagon and a base in Iraq. It was the 10th time the nation has paused to remember a defining day. In doing so, it closed a decade that produced two wars, deep changes in national security, shifts in everyday life – and, months before it ended, the death at American hands of the elusive terrorist who masterminded the attack. A woman at the National September 11 Memorial, Sunday, Sept. 11, 2011, mourns the loss of her son who died during attacks at the World Trade Center, Sept. 11, 2001. Hikers unfurl a large flag on the top of Peak One of the Ten Mile Range outside of Frisco, Colo., Sept. 11, 2011. The Sunday following the terrorist attacks of Sept. 11, several dozen friends climbed the peak to raise an American flag, and on Sunday, many of the same group made a return trek. Dawn breaks over ground zero in lower Manhattan on Sunday, Sept. 11, 2011. The two memorial fountains, among the largest artificial waterfalls in the world, sit where the twin towers stood.